Katie Packer, a former senior adviser to Mitt Romney, is sending the three-page memo to Republican leaders, donors, activists, campaign operatives and pundits, describing a "playbook" to kill Trump's candidacy.

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"There is an increasing worry among many Republicans that we are about to nominate a candidate who shares none of the values our Party has held dear for decades and who will lead our Party to general election ruin in November," Packer writes.

"Many have asked me, 'What can be done to stop Trump?' The answer is simple: TRY," she adds. "In my nearly 30 years of political involvement, I have never seen a campaign where the frontrunner had no aggressive, strategic campaign launched against him."

The entire memo can be read below.

Packer is frustrated that her group, "Our Principles PAC," which has spent more than $3.5 million to date attacking Trump in the early-voting states of Iowa, New Hampshire and South Carolina, has been the only serious Republican effort so far to take down the billionaire.

In her strategy memo, which was first reported by The Wall Street Journal, Packer says that based on her group's research, "there is no silver bullet" to destroying Trump.

She argues that what will grind Trump down is the cumulative weight of his liberal record — told through his own words — on abortion, healthcare, taxes, financial support for Democrats and other conservative apostasies such as his "use of eminent domain for personal profit."

Packer's anti-Trump attacks appear to be getting under the GOP front-runner's skin. After federal election records revealed over the weekend that the billionaire Ricketts family was the chief funder of "Our Principles PAC," Trump took to Twitter to issue a threat to the GOP mega-donor family.

"I hear the Rickets [sic] family, who own the Chicago Cubs, are secretly spending $'s against me," Trump tweeted on Monday. "They better be careful, they have a lot to hide!"

Packer is currently working to secure enough money to run a national campaign against Trump that would take him on across the Super Tuesday states.

Packer refused to discuss her group's donors, but she told The Hill in a telephone interview Monday night that while she is getting lots of interest from donors — and an intensification after Trump's South Carolina victory — it remains unclear whether she will have the resources needed to run a large-scale national effort against Trump.